Rubber tapes are generally non-adhesive, and are either equipped with a liner or are linerless. Stretched and overlapped layers will fuse or bond together to form an effective electrical insulation and moisture barrier. For low-voltage (1000V or less) applications, rubber tapes should be stretched during wrapping so that tape width is reduced to approximately 75%. For high- and medium-voltage applications — where the electrical stresses are high (e.g. connector areas, lug areas, and cable shield cut-back areas) — tape should be stretched just short of its breaking point.


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On the other hand, duct tape is a cloth-backed pressure-sensitive tape made of a thin polyethylene-coated cloth with fibers and a rubber-based adhesive on the other. This composition makes duct tape extremely durable, water-resistant, and great for a wide range of applications.